1) No hard and fast rules here. Just be considerate, I try to do the same. If you hang up once every hour or so, no big deal. If I have to circle back every 5-10 minutes, then as a boater it gets old fast and distracts from my fishing. On the flip side, I used to fish as a coangler and no one is expected to be perfect. As others have mentioned, if you're way off behind the boat with a shakey head, just break it off and tie on a new one. If your Vision 110 is on a dock cable, it would be take a real jerk not to go back and get it for you!
2) Not wrong but.. don't take it personal if the boater isn't interested. The most annoying thing for a boater is drawing a coangler and 2 minutes into meeting him he wants to know how many fish you're on, I got a spot where my buddy and I whacked them here yesterday, etc, etc.. It's a running joke in most circles. Personally speaking, I bought a boat to make my own decisions, game plan, etc. You don't like it, don't enter or step up to the pro side yourself. On the flip side, I've had a few boaters ask in my coangler days and contributed before. So as a general rule, I'd say keep those kinds of things to yourself unless asked. If they're that desperate they may ask.
3) I agree with you 100%. Even as a boater, I generally don't even attend these anymore..
Have fun and good luck!